Your cognitive skills issues are showing. No one pushed the Emperor into the broadcast; certainly not the military dictatorship who controlled access to the Emperor. He was well aware of the destruction of Japanese cities, and could see how Tokyo had been flattened by the fire bombings. He had to wait for the proper moment to intervene.
You probably are not aware that the Imperial line had even less actual power than the modern British royals. The Imperial line had continued for over a thousand years by always providing a male heir, marrying a daughter of the ruling clan, and scrupulously avoiding the divisions and assassinations inherent in wielding power, while letting others actually rule from behind the scenes,
In fact there was a plot by some officers to kidnap the Emperor and take him to Manchuria. It is not a revisionist view that the Soviet entry into the Pacific war was a turning point in the Emperor's view. It was always thought by most Japanese at the time, and in some circles still is thought, to be the event which made the unconditional surrender possible, only because the battle hardened and well equipped Soviet forces so easily defeated the demoralized and exhausted conscript Japanese army, quickly overran Kamchatka island, and combined with Mao's 8th route army put the Japanese forces in Manchuria to disorganized flight. (Manchuria was a puppet kingdom of Japan seized in 1932 and renamed Manchukou* (State of Manchuria) in what is now called the North East Provinces ~ Liaoning**, Jiling, Heilongjian, Manchuria had been spare the allied bombings and still had it's manufacturing intact, so the die hard militarists expected they could regroup and retake the offensive from Manchuria as a base. Apparently the Japanese high command could not bring themselves to realize that their conscript army was done for.
*The Manchu are a minority group within China, the 5th largest, with their own language and writing system. Manchus have headed two dynasties, the Jin and the last dynasty, the Qing. Manchu is now an endangered language, with most Manchu people speaking Mandarin Chinese. China has established schools to keep 2nd language Manchu alive. Since the records of the Later Jin (1616-1636) and Qing(1636-1912) were written in Manchu script it is necessary to preserve the ability to compare the Chinese and Manchu documents of the periods as well as documents of the Jin(1115-1234) founded by Manchu related group, and written in the Tungistic language and script.
**Liaoning Province is the namesake of China's first aircraft carrier, so chosen because Liaoning Province is considered to be the end of China's last colonial imperialists, and symbolic of her determination never again to be under the yoke of foreign imperialists.